SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '12e9ae7f50e6c79b1afa06f0e61a133c9ffc59631db70514363c709db50c3447' 
  AND token = '5vzsbgcRWoX2FGb6hR/L+YD0BPYZgnChupirAx/yx/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}